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l+2l=36/2
We move all terms to the left:
l+2l-(36/2)=0
We add all the numbers together, and all the variables
l+2l-18=0
We add all the numbers together, and all the variables
3l-18=0
We move all terms containing l to the left, all other terms to the right
3l=18
l=18/3
l=6
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